| Meaning | (physics and chemistry) the smallest component of an element having the chemical properties of the element. |
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| Category | chemistry, chemical science | The science of matter |
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| physics, natural philosophy | The science of matter and energy and their interactions |
| Part of | chemical element, element | Any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter |
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| molecule | (physics and chemistry) the simplest structural unit of an element or compound |
| Parts | elementary particle, fundamental particle | (physics) a particle that is less complex than an atom |
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| nucleus | The positively charged dense center of an atom |
| Narrower | carbon atom | An atom of carbon |
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| free radical, radical | An atom or group of atoms with at least one unpaired electron |
| hydrogen atom | An atom of hydrogen |
| isotope | One of two or more atoms with the same atomic number but with different numbers of neutrons |
| monad | (chemistry) an atom having a valence of one |
| Broader | substance | The real physical matter of which a person or thing consists |
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| Spanish | atomo, átomo |
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| Catalan | àtom |
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| Adjectives | atomic | of or relating to or comprising atoms |
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| diatomic | of or relating to a molecule made up of two atoms |
| monatomic, monoatomic | of or relating to an element consisting of a single atom |
| polyatomic | of or relating to a molecule made up of more than two atoms |
| subatomic | of or relating to constituents of the atom or forces within the atom |
| Verbs | atomise | spray very finely |
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| atomize, atomise | break up into small particles |
